From the musical “WATCH YOUR STEP,” 1914.
Words and music by Irving Berlin.
Published as part of the Piano-Vocal Score ©27 Jan 1915.

The sheet music:
Accompaniment by James Pitt-Payne:
Lyrics
Look at ’em doing it
Look at ’em doing it
That syncopated walk
What do you think of it
What do you think of it
We really hope you like it
Look at the lady fair
Doing it over there
Don’t laugh at her because
You’ll be doing it, too
Before you roam back to your home
There’s really no denying that
You’ll be trying that step
It’s full of Pep, full of Pep
And in the morning when you rise
For your morning exercise
You’ll take a syncopated walk